My Desktop Board is Intel D945GCNL.There was no problem with my MB running windows 7,it was rocking with a base score of 3.3(For aero),but yesterday suddenly my aero effect got disabled,in device manager the display adapter says "Windows has stopped this device because it has reported problems. (Code 43)",Now system rating is not shown,also the problem is not solved even after formatting,reinstalling the BIOS update,I think this happened after when I selected the option "setup defaults" in BIOS menu accidently,Anyone please help me to restore my System back to normal.I am really worried now:(

If reloading the BIOS default settings helps not, and Device Manager shows no conflicts, I'd suggest trying with a compatible Operating System although Windows* 7 had worked fine before; see the following URL for the officially validated/supported Operating Systems: